Numerical and experimental investigation of the influence of infrared reflective interior surfaces on building temperature distributions

Abstract

Radiative properties of interior surfaces can affect not only the building heat flux but also the indoor environment, the latter of which has not been thoroughly investigated. The aim of this study is to analyse the effect of surface emissivity on indoor air and surface temperature distributions in a test cabin with reflective interior surfaces. This was done by comparing experimental and simulation data of the test cabin with that of a normal cabin. This study employs transient computational fluid dynamics (CFD) using re-normalisation group (RNG) k-" model, surface-to-surface radiation model and an enhanced wall function. Boundary conditions were assigned to exterior surfaces under variable outdoor conditions. The numerical and the measurement results indicate that using interior reflective surfaces will affect the indoor air temperature distribution by increasing the vertical temperature gradient depending on the time of the day. CFD simulations with high spatial resolution results show increased interior surface temperature gradients consistent with the increased vertical air temperature gradient. The influence of reflective surfaces is potentially greater with higher indoor surface temperature asymmetry. The vertical indoor air temperature gradient and surface temperatures are important parameters for indoor thermal comfort.

Computer Added Simulation of the Spread of Multidrug-Resistant Bacteria in an Radiation Therapy Shelter Based on Computational Fluid Dynamics

“…It can be seen from Figure 3 that the suitable temperature and air flow speed measuring points are the most in working condition (6), and the suitable air flow speed measuring points are the least in working condition (8).…”

“…Detailed analysis is as follows: secondly, a controlled natural ventilation structure can be used in the radiation therapy ward. For example, the breathing wall technology frequently used in foreign countries in recent years combines the visual effect of the glass curtain wall with the environmental function of natural ventilation [5][6][7]. Opening windows for ventilation in the room avoids the disadvantages of opening windows in high-rise radiation therapy wards.…”

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

“…ANSYS Icepak (Icepak 2009) was used for building the model and grid according to (Joudi et al 2015). The transient boundary conditions were assigned in ANSYS FLUENT for numerical solution.…”